Journal of Geographical Sciences >
Investigating the dynamics of wetland landscape pattern in Beijing from 1984 to 2008
Received date: 2011-04-12
Revised date: 2011-05-25
Online published: 2011-10-03
Supported by
Technology Plan Project of Beijing, No.D08040600580801; International S&T Cooperation Project, No.2010DFA92400; Project of Beijing Municipal Commission of Education, No.115304535
The landscape pattern of Beijing wetlands has undergone a significant change as a result of natural and artificial elements. Supported by remote sensing and GIS technology, using multi-temporal TM images from 1984 to 2008 in Beijing, this paper analyzed the dynamic characteristics of wetlands landscape pattern through selected typical indices including patch area, patch average area, fractal dimension index, diversity, dominance, contagion indices and the spatial centroids of each wetlands type were calculated. Finally, the paper explored the evolution mode and driving factors of wetland landscape pattern. The results were obtained as follows: the total wetland area increased during the period 1984-1996, then decline from 1996 to 2004. The wetland area in 1994 accounted for only 47.37% of that in 2004. The proportion of artificial wetland area was larger than that of natural wetland. The proportion of reservoir wetland was 33.50% to 53.73% and had the maximum average area. pond and paddy field wetland type with the least average area accounted for 16.46% to 45.09% of the total wetland area. The driving forces of the natural river wetland were mainly natural elements; its fractal dimension index was greater than the others. The Shannon diversity index of wetland landscape increased from 1.11 in 1992 to 1.34 in 2004, indicating that the difference between proportions of each wetland type decreased and areas of each wetland type were evenly distributed. The contagion index went down from 65.59 to 58.41, indicating that the connectivity degraded. Miyun Reservoir had the largest area and its area change had a great impact on the location of the centroid. Wetland resources degenerated gradually from the joint effects of natural and artificial factors. During the period 2006-2008, the precipitation increased and the drought condition was relieved. The government implemented series of positive policies to save water resources, and the wetland area increased.
ZHANG Yiran, GONG Zhaoning, GONG Huili, ZHAO Wenji . Investigating the dynamics of wetland landscape pattern in Beijing from 1984 to 2008[J]. Journal of Geographical Sciences, 2011 , 21(5) : 845 -858 . DOI: 10.1007/s11442-011-0884-z
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